Table of basic physical and chemical constants
Table show common constants used in physics and chemistry.

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Basic physical and chemical constants

ConstantSymbol or definitional formulaValue
Speed of light in vacuumcc2,9979250108ms2,9979250 \cdot 10^8 \frac{m}{s}
Elementary chargeee1,6021761019C1,602176 \cdot 10^{-19} C
Avogadro's numberNAN_{A}6,02216910231mol6,022169 \cdot 10^{23} \frac{1}{mol}
Atomic mass constantudu^d1,6605311027kg1,660531 \cdot 10^{-27} kg
Mass of electronmem_e9,1095581031kg9,109558 \cdot 10^{-31} kg
Mass of protonmpm_p1,6726141027kg1,672614 \cdot 10^{-27} kg
Faraday's constantFF9,648670104Cmol9,648670 \cdot 10^{4} \frac{C}{mol}
Planck's constanthh6,6261961034Js6,626196 \cdot 10^{-34} J \cdot s
Fine structure constantα\alpha7,2973511037,297351 \cdot 10^{-3}
Charge to mass ratio of the electroneme\frac{e}{m_e}1,75880281011Ckg1,7588028 \cdot 10^{11} \frac{C}{kg}
Magnetic flux quantumϕ0=h2e\phi_0 = \frac{h}{2e}2,06785381015Wb2,0678538 \cdot 10^{-15} Wb
Rydberg's constantRR_{\infty}1,097373121071m1,09737312 \cdot 10^{7} \frac{1}{m}
Bohr radiusa0a_05,29177151011m5,2917715 \cdot 10^{-11} m
Compton wavelength of the electronλc\lambda_c2,42630961012m2,4263096 \cdot 10^{-12} m
Electron radiusrer_e2,8179391015m2,817939 \cdot 10^{-15} m
Compton wavelength of the protonλp{\lambda}_p1,32144091015m1,3214409 \cdot 10^{-15} m
Gyromagnetic ratio of the proton with diamagnetic H2O correctionγp{\gamma}_p2,6751965108radsT2,6751965 \cdot 10^{8} \frac{rad}{s} \cdot T
Gyromagnetic ratio of the protonγp\gamma^{'}_{p}2,6751270108radsT2,6751270 \cdot 10^{8} \frac{rad}{s} \cdot T
Bohr magnetonμB\mu B9,2740961024JT9,274096 \cdot 10^{-24} \frac{J}{T}
Nuclear magnetonμN\mu_N5,0509511027JT5,050951 \cdot 10^{-27} \frac{J}{T}
Magnetic momentic of the protonμp\mu_p1,41062031026JT1,4106203 \cdot 10^{-26} \frac{J}{T}
Gas constantRR8,31434JmolK8,31434 \frac{J}{mol} \cdot K
Boltzmann's constantkk1,3806221023JK1,380622 \cdot 10^{-23} \frac{J}{K}
First radiation constantc1c_14,9925791024Jm4,992579 \cdot 10^{-24} J \cdot m
Second radiation constantc2c_21,438833102mK1,438833 \cdot 10^{-2} m \cdot K
Stefan-Blotzmann's constantσ\sigma5,66961108Wm2K45,66961 \cdot 10^{-8} \frac{W}{m^2} \cdot K^4
Gravitional constantGG6,67321011Nm2kg26,6732 \cdot 10^{-11} \frac{N}{m^2} \cdot kg^2
Molar volume of gas under normal conditionV0V_02,24136102m3mol2,24136 \cdot 10^{-2} \frac{m^3}{mol}
Vacuum permittivityϵ0\epsilon_08,85421012Fm8,8542 \cdot 10^{-12} \frac{F}{m}

Some facts

  • Physical constants (sometimes called chemical depending on context) are physical quantities, whose value doesn't depend on time or space. Simply put, value of physical constant is always the same no matter when and where it is measured.
  • There are many physical equations containing one or more physical constants. Often they play a role of proportionality coefficient. Examples of such equations may be:
    • Clapeyron's equation (perfect gas equation):
      pv=nRTpv = n\fbox{R}T
      • p = pressure,
      • v = volume,
      • n = number of moles,
      • T = termodynamic temperature,
      • R = gas constant,

    • the force of gravity, i.e. the force that attracts two bodies with masses:
      F=G×m1×m2r12F = \fbox{G} \times \frac{m_1 \times m_2}{r_{12}}
      • F = force of gravity,
      • G = gravitional constant,
      • m1 = mass of the first body,
      • m2 = mass of the second body,
      • r = distance between bodies,

    • photon's energy:
      Ephoton=h×cλE_{photon} = \frac{\fbox{h} \times \fbox{c}}{ \lambda}
      • h = Planck's constant,
      • c = speed of light in vacuum,
      • λ = wavelength.

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